What type of highway allows vehicles to enter and exit only at interchanges?

The correct choice is controlled access highway because this type of highway is specifically designed to limit access points. Vehicles can only enter or exit at designated interchanges, which helps maintain a higher speed and smoother flow of traffic. Unlike roads where drivers can turn off or on at any point, controlled access highways minimize interruptions caused by entering and exiting traffic, reducing the likelihood of accidents and promoting faster travel times. This design is crucial for safety and efficiency, especially on high-capacity roads intended for long-distance travel.

While state highways, U.S. highways, and interstate highways may exhibit similar characteristics, they can also have intersections, driveways, and other access points that aren’t regulated, making them distinct from controlled access highways. Thus, the defining feature of a controlled access highway is its restricted access, which ensures that vehicles can only interact with the main roadway at specific points.